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NDVI image

From [email protected]@21:1/5 to All on Tue Jan 17 21:26:01 2017

I have an ndvi image, let say https://www.urbantoys.com.au/wp-content/uploads/2016/06/DroneDeploy-NDVI-Example-Image-2.jpg

I need to mark the red portions (not all but the ones which are dense), how can I proceed.

Thanks
-Aman

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